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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '041c93cda5e069fa137026d4fa55ab25b780ff8b855e4463dbc208a13c867f44' 
  AND token = '3UjSmpTblGy7C0RGokgS1ei1hYFaeOfoc4xcGdcQg9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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