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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2440f2eafeca317cf1d8a7625c5ab2e978a014be24ac8508b678d7b84dcab4a9' 
  AND token = 'LGM9oeZbE7ogQOssUpS+gUBegvyhsKuc7vSoeNJgesg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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