SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f61e570099f5ddbdd4e16154abb837659dfec38e8b7e98a8932a6e1f2ff7bb00' 
  AND token = 'ooa+M9pkvLSOZuw3nbDhTMO+xw1gDkqGxA5YcbKCI10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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