SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd017d44e326f2a2310f67223dd5a0649ba78d34548d2c3198fc4b417bd7f9215' 
  AND token = 'XN7z1FUS8Px0hHW/Wo2KqgQKlHdYVjYvOHfJmx1Vyc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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