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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '846fdd07990b29eb576db8c69a90317c4029a249b18f00d533931d234090d5ca' 
  AND token = '1tziyawDY+6JaMOwcidzK98eP8ViVjOwzy+RjjI/wUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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