Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9efba76b5ae257df9560f1daa74a9ae88a18bbb98681c885d57ad0774b43fb2' 
  AND token = 'Jt8ym6sbkXjN63Xwgd9XOpe4wPC+ZxAhPeuVn6NGAA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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