SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b02d21a7210539454571f32000156653a586285a8fb0bc540c54354e76792a82' 
  AND token = 'TfbPWbHXy8pZKnGgegj92fgIyvlKDZpmu2BGZnXf8Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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