SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9e6b45c3f5a8243a5ba8e07af8c07739e6aca1fe7ed03ebb509b86e4cb38fbc' 
  AND token = 'l6Z5mvDJ7MGdn/UAuhMqwJxB5BbuKKvecjtwI1BrK7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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