Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '485fe3a4ff4bdb566c314ac1dc50f5eb7d2883b5d7e7cb6a6f4330395c01121d' 
  AND token = 'X+388YJGYHdjBsa+65R9XmsgvVtAy3iu3eEd7VB2RRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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