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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a646a5a60427c81a117307bd5d07718a198cded5abbb667d48749dce39f140c' 
  AND token = 'gz4KSQkWwmmiglen5LZIgF8VciUN9At+lWOrJ9kDyaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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