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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a022f59f714e8d9f3a8359aca52c0751e2f98f33915ea6d38da64caf6c38626b' 
  AND token = '7b8ruEo3bi1IxZQV7lkl7bXDJzxp4FYaL7crxpZhgmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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