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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a82c60adf24de67dab59f1e4bce92807567656ef45e2517f263598c7f8aeeed' 
  AND token = '4rsgNkCP7/GVG0Og4zTNzRxbtbEs9/Rq9OgqGOEDotg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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