SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '912e8ca2bd831c9e5e53180b175d6d472da29794fd98b5d872176f0d7620f143' 
  AND token = 'VaJFxw7+zyh1s0HML+4KA0OigfcPSiwu1kftzkMCJz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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