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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85c1d90937a17efa22ea8e8d1277d320535d972e3260469656803fbc36dc072f' 
  AND token = '/CExOocxqYCtPbQiZd4ph2rEZPqYP0drpYghqMDKRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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