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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b4d054b1d8ecc2f42e5a889e81afb655e08effc1519754d71b7276b3bfd2242' 
  AND token = 'AWgeZZtmhU6A9vwQMWnNOgmCIiiyaeVUM/6kt8p0HSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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