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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c261cbe8fe64fa80243422a972517bc85aef9dce808cae1d7676362e0a9bc9c5' 
  AND token = 'rDanVsHswtbvf4yjPP5HREz+c72d67PTFb6uI3WnS6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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