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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e6a0d385d9b90f6ade5e04243e24dbeabc659e5bd0f6618969eee7a77094b60' 
  AND token = 'yg+Wm9qQ7/P/Q9Mj+oiLv7GrBnhjp2yHPRqqNQoQmk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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