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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8859c5b811e5d70a04076339dba16fe343c96a5181db1b1123bd0ee9409740e' 
  AND token = 'NI+SjicN0sDuFxQo7tJPUVDoz+1llpRjc1MJv1RBZJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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