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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53da6c40cb597a8e0f871ae28ae2eb22f607e8d8fdf814d1052e9439ae4a4f2e' 
  AND token = 'O7n69PVrs0i72Knhhw+TYm92/ZaFa15SP3t266GQ+Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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