SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4759192d107be84843f7d1a95414e90467425cba5b28530f73f38ff69458afb4' 
  AND token = 'omnNlvrWk6YQ8V9U/DEPYvBCGS6935zLjxTxokZI9HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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