SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc1c4e80354bd4b6bf6ff034c20429ac1692c4e6e06bb750f6f8da88cbcae1a7' 
  AND token = '5+O0wuWyLjSwBRGORMgxwH5OJd3gQ8kpZo/PbYPqsrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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