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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7ffae5b96cf2fadbf4636e78337bcbbbaa21ae85c30a1d2d727bc5f610fbad3' 
  AND token = 'W9OHiPEW1Y0S3gbJ/POAhRRMLxfhQIDYjGt8LIaBdpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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