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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff44b1b87912dd5d3c0f949a8e472e6f275982339d8d72614827257721976780' 
  AND token = 'L5ALAHraGZx6teD8QNjDvRY1NOFkeFha2yLFlHpskVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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