Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61d8792ec68101920d619dd0b97a7b9829ef6a4f4da33bb641a29bac9479f0e' 
  AND token = 'fiaW3WK4xZ4L0Hms65h/QDVh9Yp+j3tH4T6o4/X0wQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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