SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c77c5889467f124cec806cc16f9b8738b38a3de26b90493b9f7421c6c32624a' 
  AND token = 'KOGutrIZOQiHP5OjnnM0Iv7GfLKHYPLVNSQVixVt5Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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