SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2456830777b1d426aa466dc585ccc6af5d31853a2104bdf0b4b007cb209480' 
  AND token = 'YHsVnYuWeWXj3vZMBl65vaMoIKa2DeUDdEUTZKQZR+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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