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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee3a7d6ca69d1095c7c97b85ae869f09b9d9021e120e1f5087b72698a5306de3' 
  AND token = 'Zl4rx1nKzLGOqfNfWCOs1PTxnTOISxdvpWaVz3O6lqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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