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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66d5bd045c16fcbe4064e29e2cfad6128360dc97626140cab00a8fb0de948f60' 
  AND token = 'Ju6xa2HyxLZk8NpPnY3ztqU/afeMFuCJz2GMoDAljks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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