SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffea79463715d63a0843cb6ba85c55b382febb6187b5d2766ab2907d18bf0b68' 
  AND token = '7xVupYjsSUeVXUw/xGktOvrgo9lgplkuZHaca1qimGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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