SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '311c650ea58c82242be3b9740fdf1d76102e5a3441c01009084926ef32a85ccf' 
  AND token = 'eKn375ZqEPjZ/AJeyjSQWGc07qGPUKYiDzU3pk9l9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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