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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f36aeca1ab87682bfe161aa58019a5858ac774152c78ca6b440b31f3a46aace7' 
  AND token = 'yTOLwpIOUGI6eGjGW1LcQvOzqNCcOOAZizsex8I7J80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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