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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f02ced63d68b5a0e4e4b83d8c96bd19340832f0a895648edc589bb967ea76fc' 
  AND token = 'gugwmX+l2zFd6HilZLX4ouIgO+SXsHtzlU08hGS9m9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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