SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c964d9378d0e8e3fb49baf244636c7c56f3c21a171875fb115b2c3f25d7d32f' 
  AND token = 'nvtlGsS3sIBqcMhmteuU4Z+PnZfmeId9DGq8lCAofPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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