SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ded0a742773e76413a751aabd970c19bd203437c632a6f0c1a09b3f8254a1ab5' 
  AND token = 'KmY6Y+dvrOWLPG+EERlZwZJVCGV6tu+yLFcjPFx/kFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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