SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0416a56341682abc872e834b8d204e24fc909b2583222c77c1f229d53cda1bc2' 
  AND token = 'Zk5uYMGYGJxUWyKvNQUbHi+mD/59m+6Y2b2FCItlg1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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