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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87a947224001a5c6f0e5b60bb927458c5d429d8cb9190eb253e91bf494e68462' 
  AND token = 'yiOTyDPrQGsaw8XERI0zTJa8iejfrotwlfBqJVFJSEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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