SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '001d690734539cda7f44d00f9d865cd169ea69f2f3815da265ffc62097fbe4fe' 
  AND token = '7DQiYihwqa784ZQ7UVpETj6NLEOSsvIOEA1zYyGFGK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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