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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af5c0f026ed7ef9ab4b82a6954198b51015d65e9c76b48b5be34dae940ee1da1' 
  AND token = 'ccM9gtuoZ9IONEv6dKzIDvOILnwYAWoBZIGkfQODP54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}