SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86eff9a571f5164fcd7669dfd39dd444ba340f17bb4d2c945df3309ce20794a5' 
  AND token = 'FPZfm/SoaXTOF/8xAIyRotN0HGmj5nvt/NVcG7ywKY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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