SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4198e47d42a30c02e568365dcdbbc207671d15cfc3a29f0258a26041634a4fe7' 
  AND token = '1IUqz3Ye0zSGLde6GR1FV/iRglYDlwcbGeVTfg1j9rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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