SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dcb93d77c999608bf5ea8ed1b33505240228461d741982f6b4d0b90ed0e3f31' 
  AND token = 'HYhnS2BK+fkNWZAUR2ZyvneOYNB4+hTRqLYl4sIfYvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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