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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f31eb001ef1ba33e71ad10ffd5deead8dbcc7b0ef6bf3712a320555ab8d86612' 
  AND token = 'DXhIel90DQ3ZRxY4aLVG95kb9pUGBHxiXX7kxud1hGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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