SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7feef064543811f60d8fea761270b4bffc2d6107c5ea42ea4c77c736179f3aa2' 
  AND token = 'w/yXOLdGcJhPV3vA0dbiRKNS5MxjfROIqVahGLXwYG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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