SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11790adeef39a77a32f16cf543f75818f31ed6ca546ad03f5d42685dbba1848e' 
  AND token = 'YaUXEp/pTzAt2+P0mGNs2KxN4wKzbkRZ8PsSdWy/cHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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