SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e5ffad642fd3064a07c5d8a5834bd176627b10036a83334880f585379be9aff' 
  AND token = 'CJGImMSKsDcGdxDSlxkoP1BNtZ1IEXKVdE/sRAnBbGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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