SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4073665ecbf8823aa0602556557cc099e3f3176d47bf9069f28da3455dc31d81' 
  AND token = 'F93yPMQSK+FBdlZg0Obga/5kDtoSdQ8GOi5J52vhQF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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