SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c8d077d7419bf6729db60d3431497f3cd71598a3dff40cb4c58cf5ee4e4ad5f' 
  AND token = '8hZOPIIB8CDIKObsB2wIk2kabAHHsFTZvw3YSzsJmKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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