SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b9d6ab2b864aa384295aeaaca6068a7a76c68f333f27b1fae9517f509c34fe7' 
  AND token = '/iG+OuXVe+gF6JT1UVgQ4lh61I0iLahwnZqy0mUm95A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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