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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e451c66198825a5c6e456902017dea1233c58e17612aa641e63ef4fd16586b2d' 
  AND token = 'cqbrx10aHfcpARhH1qijx8RQc5hVWvyExi3mzOCK8x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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