SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f6a70577d6e5b9d36ef7d62cea0aab2e514239cf90294fb5a6971458dfdf3bf' 
  AND token = 'TzZgeitItct4g78/DWhUc6iujaqT+05VKsehifqZXvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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