SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4108f7eed4dd0f8e985bd6cd0005192d7f742604a905405b228ae6fae26c4644' 
  AND token = 'bIYTm+v0uL+hnKQJ9d9zPorgwuVuLHF0K5JHxvKGah4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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