SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4535b3cf8127a8d8b0f132ce76c5f09948ce5879b7b62d465933fb5d001c1999' 
  AND token = '7bbdvoICzcfbCjjATdvZfGzBtAiY3MTRB9gzKxIaOp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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