SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2718955603625413d8bababe141071b2e8870185fd84c6512d197e1a09e3c4bc' 
  AND token = 'IIgbJClPdtMfpabBPGNMGHp7F3nAywYg+bKYNXhX8E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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