SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4344fd05cb5096bc66958e62b53d0b83dd2d133354134ffecbcab2f2f485b245' 
  AND token = '0qJwO4Nyige4+iC+Dyf/+C2e9Gh6hnvQqa6UhXDZBFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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