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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93882c9928a8075d61b3969843828468395b8d2837c948053c54d0c86a90d7a7' 
  AND token = 'Ae0vsFu0lm4VxGbvNEcmOnsu6+tG7SWOumJSm0D5mcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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