SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bde3df804ac3bbe35a948e2c3df2e516ff521526f7f6d479c6216b9108b67b4' 
  AND token = 'pm4O1uSj1zwgTm9Bq3FDsCNgdph/Q1Ht9XSx/qhTP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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