SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b722a1c8d95f91b0a678be0f533404b678ab5e5f1ae9ded9b33610b44eee711b' 
  AND token = 'hgwbJgK5t/yOftkun7rG5F4QZwhG+/ikH4FUkqAhKIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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