Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5250959c503d8506da260e40fc1a97f843178d18139f9784c1f291e1476a35be' 
  AND token = 'iyc3crlj2tw5d6JUB6MuoYwZXPMZP14Sq86UuCn4fMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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