SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '157cbe937d1a75054ae887c07c903a4ab627ea49c7f97efc7fbf0c625d0f4a82' 
  AND token = '8oaA78VNFr6Qu7a/RC9qVvxKBWHGOqVTRg5W+VVGqj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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